richtextbox c# auto show

So heres my 1st question,

i have a rich text box control in c#, problem is, i have to scroll down to see the latest stream(im using filesystemwatcher). now, how can i make the richtextbox to display the last line so that 开发者_如何学Ci do not have to scroll down. thanks. (in other words, i want richtextbox to show the latest text)

Also 2nd question, how do i create a file using an object and close the stream object. coz i want to overwrite an existing file.

something like this could you do for qouestion #1

txtBox.ScrollToLine(txtBox.LineCount - 1);

now you will always see the last line

edit: just saw it's a rich text box. Just do this:

txtBox.SelectionLength = 0;
txtBox.SelectionStart = txtBox.Text.Length;
txtBox.ScrollToCaret();

if you want to overwrite a file just do this:

FileStream fileStream = new FileStream(@"c:\file.txt", FileMode.Create);

Try with:

 rtb.SelectionLength = 0;
    rtb.SelectionStart = rtb.Text.Length;
    rtb.ScrollToCaret();